Investigating Changes in Satellite Cell Activating Factors Induced by Circular Resistance Training and High-Intensity Functional Training in Inactive Men Aged 18-28

Satellite cell compartments endow skeletal muscles with remarkable regenerative capacity. However, it is not yet clear to what extent these cells facilitate exercise-induced adaptation. Therefore, the present study was conducted with the aim of investigating changes in activating factors of satellite cells (MyoD ‎‏and‏ Myf-5‎) induced by circular resistance training (CRT) and high-intensity functional training (HIFT) in inactive men aged 18-28.

In this semiexperimental study, with a pre-test, post-test, and a control group, 45 inactive men aged 18-28 were selected and randomly divided into three groups: HIFT (n= 15), CRT (n= 15), and control (n= 15). Both training programs were performed for 8 weeks, three sessions per week, and 40-50 min for each session for the experimental groups. Blood sampling measurements were performed in two phases: pre-test and post-test. The data were analyzed using the Covariance and Benferroni post hoc tests using SPSS 24 software at a significance level of 0.05.

The results of the study showed that both training methods had significant effects on increasing MyoD, and Myf5 in inactive men (p≤0.05). However, the improvements in these variables were higher in the HIFT group compared to the CRT group (p≤0.05).

These results indicate an increase in MyoD and Myf-5 values following the exercise. Therefore, these exercise methods, especially HIFT, can be effective in hypertrophy and increase muscle strength by increasing the activating factors of satellite cells.